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Old 21st August 2010, 05:40 AM   #1391
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Hi soho54,

Quote:
Originally Posted by soho54 View Post
I have some questions about when it is best to use the Par calculations instead of the conical.

As there was no new width or starting height input I have been assuming that the Par just calculates a set profile Parabolic dimensioned segment. As the Parabolic oval is a better match for a rectangle it should work out pretty good.

With this in mind is it better to switch over to the Con sections if the horn is running closer to a square at that point of the horn?
I am not sure that I understand your question correctly, but in essence it is theoretically more accurate to use a parabolic area expansion rather than a conical area expansion when the horn has two parallel walls and two linearly-tapering walls (similar to the first segment of a Klipschorn bass horn).

In practice, the difference in SPL results using either a parabolic or a conical expansion will be minimal in most cases for a bass horn. The difference in physical volumes however, could be reasonably significant in some situations.

Because Hornresp assumes an axisymmetric (circular cross-section) design, width and height dimensions are not needed when calculating performance results.

Quote:
Originally Posted by soho54 View Post
Also do you know if Bjørn has posted/published these calculations anywhere yet?
Bjørn has not published his work yet, but he may do so eventually.

Kind regards,

David
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Last edited by David McBean; 21st August 2010 at 05:54 AM.
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Old 21st August 2010, 05:46 AM   #1392
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Quote:
Originally Posted by epa View Post
it would be nice if you can implement x-overs and/or eq in hr.
Hi epa,

Please see my Post #1369.

Kind regards,

David
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Old 21st August 2010, 08:43 AM   #1393
epa is offline epa  Netherlands
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Quote:
Originally Posted by David McBean View Post
Hi epa,

Please see my Post #1369.

Kind regards,

David
sry, missed that.
i get your point.
it would be helpfull though.
anyway i enyou your program verry much.thank you for that.
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Old 24th August 2010, 06:57 PM   #1394
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Getting some strange result in the loudspeaker wizard with this one using combined response.


ID=28.00
Ang=2.0 x Pi
Eg=2.83
Rg=0.00
Cir=0.40
S1=400.00
S2=400.00
Exp=100.00
F12=0.00
S2=400.00
S3=1000.00
Exp=40.00
F23=62.71
S3=1000.00
S4=3000.00
Exp=60.00
F34=50.12
S4=0.00
S5=0.00
L45=0.00
F45=0.00
Sd=839.82
Bl=18.66
Cms=1.87E-04
Rms=4.99
Mmd=50.12
Le=0.71
Re=5.00
Nd=1
Vrc=0.00
Lrc=0.00
Ap=0.00
Lpt=0.00
Vtc=10000.00
Atc=840.00
Pmax=100
Xmax=5.0
Comment=NEW RECORD - B&C 15pe40_3 BLH
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Old 25th August 2010, 06:27 AM   #1395
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Quote:
Originally Posted by David_Web View Post
Getting some strange result in the loudspeaker wizard with this one using combined response.
Hi David_Web,

Many thanks for this feedback - I get an incorrect result also.

I will investigate and let you know when the bug is fixed.

Kind regards,

David
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Old 25th August 2010, 04:58 PM   #1396
mige0 is offline mige0  Austria
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Location: Austria, at a beautiful place right in the heart of the Alps.
There seems to be something wrong with displaying Sd here ?

Click the image to open in full size.

Michael
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Old 25th August 2010, 06:01 PM   #1397
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Looks ok too me?
Don't forget you have two drivers in series.
Happened to me =)
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Old 25th August 2010, 06:18 PM   #1398
mige0 is offline mige0  Austria
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Yes it certainly looks like this - but where do I have to select that other than here:

Click the image to open in full size.

same here:


Click the image to open in full size.

???

Michael

Last edited by mige0; 25th August 2010 at 06:28 PM.
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Old 25th August 2010, 08:22 PM   #1399
witasso is offline witasso  Poland
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Dear Mr. McBean:
It seems there is another bug in the Compound Horn feature. Using the Mige0 values, the results are improper, with other drivers and parameters the same effect occurs. Any even smallest change in the values S1, S2, L12, S5, S6 or L56 changes drastically the response plot.
The OS is Vista 64-bit.
Attached Images
File Type: gif migue0-bug.gif (48.8 KB, 109 views)
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Old 25th August 2010, 08:28 PM   #1400
Kolbrek is offline Kolbrek  Norway
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The first dialog selects the number of drivers to drive the horn (speaker), the second selects the number of horns (speakers) (each with the number of drivers specified in the first dialog) used together.

In the terminology of Hornresp, the driver is the driving unit itself, while the speaker is the complete thing, including driver, front and rear chambers, ports, horns etc.

Bjørn
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